The methylation effect in prolonging the pure organic room temperature phosphorescence lifetime.

ABSTRACT: Prolonging the phosphorescence lifetime of pure organic phosphorescent materials by a methyl-substitution strategy is described. We present a chemical strategy for improving the phosphorescence lifetime of triplet excitons under ambient conditions by incorporating methyl groups into the chemical structures. This is observed by a long-lived phosphorescence lifetime of up to 0.83 s detected for methylated 9-(4-(mesitylsulfonyl)phenyl)-9H-carbazole (3M), compared to 0.36 s for 9-(4-(phenylsulfonyl)phenyl)-9H-carbazole (0M) without any methyl groups. Additionally, enhanced phosphorescence efficiency can be obtained at an appropriate methylation degree, because of the smaller ΔE _ST (singlet and triplet energy gap) and ΔE _TT* (norma

SUBMITTER: Mao Z 

PROVIDER: S-EPMC6335597 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature